发明名称 |
APPARATUS AND METHODS FOR LIMITING MOVEMENT OF GRIPPING MEMBERS |
摘要 |
Apparatus and method for limiting movement of gripping members of an elevator are provided. The apparatus includes a locking arm coupled to one or more of the gripping members and configured to move in a first direction when the gripping members move toward engagement with a tubular and to move in a second direction when the gripping members move away from engagement with the tubular. The apparatus also includes a first engagement member configured to move between a disengaged position, in which the first engagement member and the locking arm are relatively moveable, and an engaged position, in which the first engagement member allows the locking arm to move in the first direction but restrains the locking bar from moving in the second direction by more than a selected distance. |
申请公布号 |
US2012312553(A1) |
申请公布日期 |
2012.12.13 |
申请号 |
US201113578463 |
申请日期 |
2011.09.22 |
申请人 |
MOSING DONALD E.;ANGELLE JEREMY RICHARD;STELLY JOHN ERICK;FRANK'S INTERNATIONAL, INC. |
发明人 |
MOSING DONALD E.;ANGELLE JEREMY RICHARD;STELLY JOHN ERICK |
分类号 |
E21B19/16 |
主分类号 |
E21B19/16 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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